Multiple-tube-forming mechanism.



0. J. GROBHN. MULTIPLE TUBE FORMING MECHANISM.

APPLICATION FILED OCT. 24, 1912.

Patented 0013.6,1914.

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. APPLICATION FILED 001 .24, 1912. 1,1 12,695, Patented 0ct.6,1914:.

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UNITED STATES PATENT OFFICE.

OTTO J'. GROEHN, OF DETROIT, MICHIGAN, ASSIGNOB TO BRISCOE MANUFACTURING- GOMPANY, 013 DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

MULTIPLE-TUBE-FORMING MECHANISM.

Specification of Letters Patent.

Patented Oct. 6, 1914.

To all whom it may concern:

Be it known that I, OTTO J. GROEHN, a citizen of the United States of America, residing at Detroit, in the county of WVayne and State of Michigan, have invented certain new and useful Improvements in Multiple-Tube-Forming Mechanism, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to sheet metal forming machines of that type in which a tubular blank is refashioned to form a multiple unit tube.

The invention relates more specifically to the means employed for feeding the blank to the dies and for withdrawing the core member or mandrel from the formed blank, and the invention consists in the construction as hereinafter set forth.

In the drawings: Figure l is a plan view of the machine, partly in horizontal section; Fig. 2 is a front elevation.

Generally described the forming machine comprises a core member having a series of fingers or individual cores around which the individual tubes are formed, together with a series of laterally reciprocating die mem bers which successively form the sheet metal about the individual cores. Machines of this type have heretofore been made in which a single multiple unit core member is reciprocated into and out from operative relation with the laterally moving dies, the blank tube being placed upon said core member in advance of its inward movement and being stripped therefrom on its return movement. Such constructions are, however, objectionable; first, for the reason that the engagement of the blank with the core member is a somewhat dangerous operation for the workman; and further because it is difiicult to feed the blanks to the machine as fast as it can perform its operations. To avoid these objections as well as to otherwise improve the machine, I have devised a construction of core holder and feeder, in which a plurality of multiple unit cores are successively adjusted into operative relation with the dies and are alternately adjusted to a position where the blank may easily be engaged therewith.

In detail, A is the frame of the machine; B the series of laterally-movable dies; and G a reciprocatory plunger which actuates cam members D for successively operating said dies.

E is the multiple core member, the individual fingers E of which are preferably substantially rectangular in cross section, and are loosely connected to a holding member E so as to be capable of slight relative movement. Instead of employing a single core unit E, I mount a series of said members upon a revoluble head F, which latter is mounted upon a reciprocatory slide member Gr engaging parallel ways H on the frame. The slide G is reciprocated to insert and withdraw the core member from the dies, and as shown is actuated by a bell crank lever I connected by a link I with the slide and having its operating arm I in engagement with a cam J upon the rotary shaft J. This shaft rotates in timed relation to the operation of the plunger G a sprocket chain R connecting the shaft J with the driving mechanism (not shown) of the plunger C and the cam J, and is so fashioned as to intermittently rock the bell crank lever to move the slidethe slide remaining stationary in its inward position during the interval of operation of the dies B.

Once during each reciprocation of the slide G the head F is given a partial rotation which will shift one of the core members E out of registration with the dies and will move the succeeding core member in registration therewith. For accomplishing this movement I preferably provide an over movement of the lever I and connect the same to the slide G through the medium of a resilient, yieldable link. Thus, as shown, the link I is directly attached to an intermediate slide K engaging bearings upon the main slide G, and a spring L is placed between said intermediate slide and a bearing G1 on the main slide. I

M is an adjustable stop arranged in the path of the main slide G and adapted to arrest movement thereof before the completion of the movement of the lever I and slide K connected therewith, so that during this'continned movement the spring L will be com pressed.

N and N are looking dogs for engaging notches in the rotary head F; to hold said head from rotation in either direction. The dog N extends into the path of actuating pawl O on the slide K, which, during the movement of said slide after the arrest of the main slide G, will. trip said. dog bl and permit of the rotation of the head F in one direction.

P is a laterally-extending arm upon the slide K, which carries at its free end a pawl P engaging a notched wheel Q upon the rotary head F and timed to actuate said wheel after the witl'idrawal of the dog N and to turn the same through a sufl'icient angle to register the next succeeding core member with the dies. Thus during the outward movement of the lever I the slide G will be first moved to its outward limit against the stop M, after which the slide K carrying the arm P will. continue its movement and the pawl P will turn the notched wheel Q, whereby rotary motion will be imparted to the head F for turning one core member out of registration with the dies and another core member in registration therewith.

In operation the attendant places the blank tube upon that one of the core mem bers E which extends outward from the machine and which therefore is accessible and without any element of danger. The blank thus engaged is carried around by the intermittent rotation of the head F until its registration with the dies B, after which during the reciprocation of the head. G it is carried inward into operative relation with said dies. Upon. the reverse movement of the slide G- the formed blank is stripped from the core member by stripping fingers B on the dies 13, and the free core member is carried around by the head F until again in position for engagement with another blank. After each operation the attendant places a blank in engagement with the outwardly projecting core, so that all of the core H1G111- bers carry blanks as they are successively engaged with the dies.

,Vhat I claim as my invention is:

1. The combination with intermittentlyoperating; dies of a core member upon which a blank is placed, insertiblc into operative relation to said dies, and means timed with the operation of said dies for alternately inserting and withdrawing said core member, and for reversing the same when with drawn.

2. The combination with opposed, intermittently-operating dies of a series op? core members upon which the blanks are placed successively insertible between said dies, and means operating to successively insert and withdraw said core members and to reverse the same when withdrawn for engagement with the blank 3. The combination with opposed intermittently-operatingdies of a core member upon which the blank is placed, a holder to which one end of said. core member is attached, means for reciprocating said holder to insert and withdraw said core member in relation. to said dies, and means for rotating said holder when withdrawn to reverse the position otf said core member for engagement with the blank.

4. The combination with opposed intermi ttently-op-erating dies, of a series of core members upon which the blanks are placed, a head to which said core members are secured intermittently rotatable to successively register said core members with the dies, a slide upon. which said head is mounted, means operating in timed relation to said dies for reciprocating said head and carry ing the registering core member into and out of operative relation with the dies, and means operating upon the outward move ment of said slide and complete withdrawal of the core member for partially rotating said head.

5. The combination with opposed intermittently-operating dies of a series 01 core members upon which the blanks are placed, a rotative head upon which said core memhere are mounted and from which they laterally project, a slide upon which said head is mounted, means for locking; said head successively in position for registering the respective core members with said dies, means timed with the operation of said dies for re ciprocating said slide to insert and withdraw the register-inn; core member in operative relation. with said dies, and means operating upon the complete withdrawal of said core member for unlocking said head and rotating the same to register another core member with the dies.

6. The combination with intermittently operating dies of a reciprocatory member operating in timed relation to said dies, a rotary head carried by said reciprocatory member, a series of core members projecting radially from said head and successively registerable with said dies, means for locking; said head in each position of registration of a core member with said dies, and means automatically operating upon the outward movement of said reciprocatory member for unlocking: said head and rotating the same to a succeeding position for locking.

7. The combination with opposed intermittently Operating dies, of a series of core members upon which the blanks are placed, a rotative head upon. which said core members are mounted and from which they laterally project, a slide on which said head is mounted, an auxiliary slide having a spring connection with said first-mentioned slide, means connected to said auxiliary slide for normally moving both of said slides to withdraw the registering core member from operative relation with the dies, a stop for the first-mentioned slide, said auX- iliary slide being; movable after said. stop prevents the further movement of the firstmentioned slide against the tension of the spring, and apawl member adapted to turn the rotative head, operable upon the continued movement of the auxiliary slide to rotate the rotative head to register another core member with said dies.

8. The combination with intermittentlyoperating dies, of a series of core members upon which the blanks are placed successively insertible between said dies, and means operating to successively insert and withdraw said core members, said means having a primary and secondary movement in the same direction and adapted on the primary movement to completely withdraw said core members and on the secondary movement to reverse the same.

9. The combination with intermittentlyoperating dies, of a series of core members upon which the blanks are placed, intermittently-rotating holder for said core members, successively registering the same with said dies, and means operating when each core member is in registration with said dies for reciprocating the same into and out of operative relation therewith, and means for rotating said holder having its movement controlled by the means for reciprocating the core member.

In testimony whereof I aifix my signature in presence of two witnesses.

OTTO J. GBOEHN.

Witnesses:

JAMES P. BARRY, H. E. BOWMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

